Production universal grinder



y 28, 1942' A. w. WIGGLESWORTH 2,291,268

PRODUCTION UNIVERSAL GRINDER Filed May 17, 1941 s Sheets-Sheet 1 y 1942- A. w. WIGGLESWORTH 2,291,268

PRODUCTION UNIVERSAL GRINDER Filed May 17, 1941 3 Sheets-Sheet 2 L/ Z9 A I' Z] r L 18 .12; 56

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PRODUCTION UNIVERSAL GRINDER Filed May 17, 1941 3 Sheets-Sheet 5 Patented July 28, 1942 1 PRODUCTION UNIVERSAL GRINDER Albert W. Wigglesworth, Miami Beach, Fla., as-

signor to Hill-Clarke Machinery Co., Chicago, 111., a corporation of Illinois Application May 17, 1941, Serial No. 393,918

2 Claims.

This invention relates to grinding machines, and particularly to production universal grinders, namely, grinders adapted for production runs and for grinding internal as well as external surfaces of work. 7

The main object of my invention is to provide motor driven internal grinding means in conventional grinders of the type shown in my United States Letters Patent No. 2,074,308 of March 16, 1937, said internal grinding means being detachably mountable in juxtaposition to the work held by the headstock of such conventional machines.

By embodying my invention in machines of the character described, conventional grinders adapted only for grinding external surfaces are converted into universal grinders suitable for production run work.

In the drawings:

Fig. 1 is a front elevation of a grinding machine embodyingmy invention.

Fig. 2 is a plan view of part of the machine, viewed from the plane of the line 2-2 of Fig. l, but on an enlarged scale.

Fig. 3 is a transverse vertical sectional view of a part of the internal grinding means, in the plane of the line 33 of Fig. 2.

Fig. 4 is an end elevation, partly in section, as indicated by the line 44 of Fig. L

Fig. 5 is a transverse vertical sectional view, in the plane of the line 5-5 of Fig. 2.

In that embodiment of my invention shown in the drawings, the grinding machine comprises a base on which is mounted the longitudinally reciprocable work carriage H. A motor driven headstock unit 12 and a tailstock [3 are mounted on the carriage H and are adjustable relatively to each other to accommodate the work which is held between them for external grinding by the wheel 14. The wheel I4 and the motor l which drives it are mounted on a base [6 which is movable transversely of the machine. The base 16 has a forward portion I! which forms a bearing for the grinding wheel shaft 18, which is driven through belts I9 by the motor [5. In Fig. l, the belts [9 are enclosed in the cover l9.

Referring now to that part of the mechanism which comprises the internal grinding means, I have provided the cut away forward portion ll of the grinding wheel base I6 with a rail 20, shown in transverse section in Figs. 3 and 5 and in front elevation in Fig. 1. The rail 20 is rigidly connected to the Vertical face portion I! of the wheel base 16 by countersunk bolts 2|. The upper and lower edges of the rail 20 are beveled or slanted rearwardly in converging directions as indicated at 22,23, respectively. Preferably the face of the rail is longitudinally recessed as indicated at 24.

As best shown in Figs. l, 2 and 3, an internal grinding tool having a shaft 26 is rotatably mounted in a bearing in a tool holder 21 which comprises a split sleeve 28 connected by means 29 to a plate 30 having an integrally formed rib or flange 3| extending rearwardly from the upper edge of the plate 30, said rib having an inclined lower surface 32 which iscomplemental to the slanted surface 22 of the rail 26.

The tool holder 2'! is mounted on the rail 20 with the plate 3!! abutting the face of the rail 20 and the flange 3| resting on the surface 22, and after the tool holder has been moved slidably on the rail to bring the tool 25 into proper position relatively to the headstock work holding face and the work W, the tool holderis fixed in position by passing bolts 33 through apertures in the plate 30 into a wedge member 34 which has an upper surface 35 complemental to the surface 23 of the rail 20. The wedge member clamps the holder plate 30 in fixed position on the rail. After the tool shaft 26 and its bearing have been positioned in the split sleeve 28, the sleeve is tightened on the tool by means of bolts 36 engaging the internally screw threaded bored portions 31 of the sleeve 28.

As bestshown in Figs. 1, 2 and 5, the motor 38 on a base 39 is also mounted on the rail 20 by means of a bracket 40 similar in function to the plate 30 of the tool holder. Said bracket 46 comprises a shelf 4| on which the motor 38 is supported, and said shelf has an inclined lower surface 42 which is complemental to the slanted surface 22 of the rail on which it bears. After the motor bracket 49 has been moved on the rail into proper position relatively to the tool 25 and its holder, as shown in Fig. l, the bracket is clamped into adjusted fixed position by the bolts 43 which extend through the bracket 46 and into the wedge member 44 which has a beveled surface 45 for engaging the surface 23 of the rail 20. Thus the motor bracket is held in fixed position until the bolts 43 are loosened.

The motor 38 is operatively connected to the shaft 26 of the tool 25 by a belt 46. Preferably the motor base 39 may be raised and lowered relatively to the bracket shelf 4| by means of the adjusting screws 47 and pivotal mounting 48.

From the foregoing description, it will be apparent that when the work W is to be externally ground, the tool holder 21 is removed from the rail 20 by loosening the bolts 33 and the clamping member34. The motor 38 and its bracket need not be removed. Then the headstock I2 and tailstock [3 can function in the usual Way to hold and rotate the work for surface treatment by the wheel M. For internally grinding the work, the tool holder and tool 25 and the motor bracket 40 and motor 38 can be placed in operative position on the rail 20 without any need for adjustment other than sliding movement longitudinally of the rail 20 to place the tool 25 in proper position relatively to the work. Since the rail 26 is fixed to a part of the transversely movable wheel base It, the tool 25 can be moved laterally of its axis as required to engage internal surfaces to be ground. 7

Changes may be made in details of construction without departing from the scope of my invention. v

I claim:

1. In a grinding machine comprising a base frame having an elongated work carriage with a head stock and tail stock mounted thereon, and a base member mounted on the base frame to one side of said carriage and having an external grinding wheel spindle rotatably mountedtherein, a rail extending along and carried by one side of said base member parallel with the spindle therein, said rail having vertically spaced supporting and guiding faces, a second base'member having relatively adjustable seating and guiding faces arranged for cooperation with the corresponding faces of said rail to clamp the faces thereof at desired longitudinal positions on said rail. and an internal grinding wheel spindle rotatably 'mounted in said second base member, whereby the external and internal grinding wheels may be relatively moved in planes parallel with the axis of said head and tail stocks for grinding operations to different longitudinal extents on movement of said carriage.

2. In a grinding machine comprising a base frame having an elongated Work carriage with a head stock and tail stock mounted thereon, and a base member mounted on the base frame to one side of said carriage and having an external grinding wheel spindle, a rail extending along and carried by one side of said base member parallel with the spindle therein, said rail having lverticallyspaced supporting and guiding faces,

a pair of base members each having relatively adjustable seating and guiding faces arranged for ALBERT W; NIGGLESWORTH. 

